STMicroelectronics LSM6DSV16BXTR

Overview

LSM6DSV16BXTR from STMicroelectronics is a 6-axis inertial measurement unit (IMU) integrating a 3-axis accelerometer (±2/±4/±8/±16 g FS) and 3-axis gyroscope (±125 to ±4000 dps FS), with triple-channel processing for motion tracking, bone-conduction audio acceleration (>1 kHz bandwidth, 20 µg/√Hz noise), and Qvar electric charge variation sensing. It operates at 0.95 mA in combo high-performance mode and supports MIPI I3C® v1.1, SPI/I²C, and TDM interfaces - deployed in true wireless stereo (TWS) earbuds for gesture-controlled UI and adaptive power management.

For engineers reviewing the LSM6DSV16BXTR datasheet, LSM6DSV16BXTR pinout, LSM6DSV16BXTR application, or LSM6DSV16BXTR equivalent, key selection criteria include its embedded machine learning core (MLC) with 4 decision trees and 128 nodes, 4.5 KB smart FIFO with compression, ASC self-reconfiguration, SFLP sensor fusion, and dual independent supply rails (Vdd_IO: 1.08–3.6 V; Vdd: 1.71–3.6 V).

Technical Context

The LSM6DSV16BXTR implements three independent signal processing channels: Channel 1 handles motion tracking and 3D head tracking via primary I²C/SPI/I3C interface with configurable ODR and full-scale ranges; Channel 2 processes audio-acceleration data at 8/16 kHz via TDM for bone conduction; Channel 3 performs Qvar sensing for tap/swipe/gesture detection using quasi-electrostatic potential variation on AH1/QVAR1 and AH2/QVAR2 terminals.

Its embedded architecture includes a finite state machine (FSM) supporting up to eight concurrent programs for gesture recognition, an analog hub for external ADC input processing, and hardware-accelerated sensor fusion (SFLP) delivering game rotation vector with static yaw accuracy of ±0.5° over 5 minutes - all operating within ultralow-power domains to enable Android-compliant always-on functionality.

Key Specifications

Pinout & Package

LSM6DSV16BXTR is housed in a compact 14-pin LGA package (2.5 mm × 3.0 mm × 0.71 mm) with exposed pad for thermal and electrical grounding. Pin functions support dual configuration modes: Mode 1 enables I²C/SPI/I3C only; Mode 2 adds TDM interface (TDMout, BCLK, WCLK) for audio-acceleration streaming.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-axis IMU applications.

Compared with LSM6DSO32XTR and BMI088, the LSM6DSV16BXTR uniquely integrates Qvar sensing, TDM audio-acceleration, and exportable MLC features - making it the only solution capable of consolidating motion, audio, and electrostatic UI into a single 2.5×3.0 mm footprint for next-gen TWS and hearables.

Availability

LSM6DSV16BXTR is available at Aetrix Electronics and suitable for true wireless stereo (TWS) earbuds, wearable health monitors, and IoT edge motion intelligence systems requiring stable component supply, RoHS/ECOPACK compliance, and -40°C to +85°C operational reliability.

Supply support for LSM6DSV16BXTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and automotive chips with vertical fabrication capabilities.

The LSM6DSV16BXTR belongs to ST's "SmartMotion" IMU product line, engineered specifically for ultra-low-power, multi-modal sensing in hearables and wearables - combining motion, audio, and electrostatic interfaces into a single system-in-package.

FAQ

What interfaces does the LSM6DSV16BXTR support, and how are they configured?

The LSM6DSV16BXTR supports I²C, SPI (3- and 4-wire), MIPI I3C® v1.1, and TDM - selected via the CS pin and internal register settings. Mode 1 enables I²C/SPI/I3C only; Mode 2 activates TDM (TDMout, BCLK, WCLK) alongside serial interfaces. Pin SDO/SA0 serves dual roles: SA0 sets I²C address LSB, while SDO outputs SPI data. All interfaces share pins 12–14 (CS/SCL/SDA), minimizing PCB footprint.

How does the Qvar sensing channel work, and what external components are needed?

The Qvar channel measures quasi-electrostatic potential variation between electrodes connected to AH1/QVAR1 and AH2/QVAR2 pins. It requires no external transducers - only conductive surfaces (e.g., earbud housing) acting as electrodes. The sensor detects charge redistribution during motion (tap, swipe) or proximity, with built-in filtering and thresholding. No external amplifiers or ADCs are needed; raw or processed Qvar data is accessible via FIFO or interrupt-driven registers.

Can the embedded machine learning core (MLC) be reprogrammed in the field, and what tools are required?

Yes, the MLC is fully reprogrammable in-system via I²C/SPI/I3C using ST's Unico-GUI or X-CUBE-MEMS1 firmware libraries. Users define decision trees using "if-then-else" node configurations, feature extraction filters, and thresholds - then export compiled models to the device's dedicated MLC memory. No JTAG or debug probe is required; configuration occurs through standard register writes and FIFO-based data loading.

What is the role of the analog hub, and how is it used with external sensors?

The analog hub integrates a 12-bit SAR ADC with programmable gain and sampling rate, allowing direct connection of external analog sensors (e.g., temperature, humidity, or bio-potential electrodes) to AH1/QVAR1 or AH2/QVAR2 pins. Digitized data is routed to the FSM or MLC for real-time processing alongside IMU data - enabling fused contextual awareness (e.g., motion + skin temperature) without host CPU involvement.